US4174985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing coupling gaskets for helically corrugated spiral pipe
Assignee: Individual
•
Filing: 1978-08-22
•
Granted: 1979-11-20
•
Expires: 1998-08-22
Abstract
Abstract A process for manufacturing helically corrugated pipe coupling gaskets is provided wherein a sheet of rectangular flexible gasket material is extruded having parallel corrugations on one side, cutting the sheet across the corrugations at an angle which is the complement of the helix angle of the pipe, and then bonding opposite ends of the cut strip to form a circumferentially continuous strip.
Inventors
- 👤 Kirby J. Buidry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:03
CPC Classifications
F; F16; F16L; F16L25/00; F16L25/0036; F16L21/00; F16L21/02; F16L21/022; Y; Y10; Y10S; Y10S285/00; Y10S285/903; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1062
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
96 words
A process for manufacturing flexible helically corrugated gaskets for use in a coupling for providing a substantially soil tight joint between abutting ends of helically corrugated pipe which comprises: (a) forming a sheet constructed of flexible material and having parallel annular-type corrugations having a similar pitch and depth similar to the corrugation of said pipe, (b) angularly cutting said sheet across said corrugations to form a strip, said angular cut being approximately identical to the complement of the helical angle of said pipe, and (c) permanently attaching the opposite ends of said strip to one another.
Claim 2
Dependent Claim
96 words
A process for manufacturing flexible helically corrugated gaskets for use in a coupling for providing a substantially soil tight joint between abutting ends of helically corrugated pipe which comprises: (a) forming a sheet constructed of flexible material and having parallel annular-type corrugations having a similar pitch and depth similar to the corrugation of said pipe, (b) angularly cutting said sheet across said corrugations to form a strip, said angular cut being approximately identical to the complement of the helical angle of said pipe, and (c) permanently attaching the opposite ends of said strip to one another.
Claim 3
Dependent Claim
13 words
A process according to claim 1 wherein said sheet is formed by extrusion.
Claim 4
Dependent Claim
14 words
A process according to claim 1 wherein said sheet is formed by injection molding.
Claim 5
Dependent Claim
26 words
A process according to claim 1 wherein said sheet is formed having a width substantially identical to a perpendicular distance between the seams of said pipe.
References Cited (Backward Citations)
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US3315991A
Cited
US3239254A
Cited
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Cited
US3708187A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-11-19 | 1983-05-21 | 1983-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-19 | 1987-05-21 | 1987-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-19 | 1991-05-21 | 1991-11-20 | $7700.00 | Window Closed / Lapsed |